What is the chemical composition of hair?

The chemical composition of hair is primarily made up of keratin, which is a fibrous protein. Keratin provides strength and structure to the hair, making it resilient against environmental factors and physical stress. This protein is also a key structural component in other parts of the body, such as nails and the outer layer of skin. The fibrous nature of keratin allows hair to withstand stretching and bending, contributing to its overall durability.

While other substances such as water, lipids, and minerals may be present in hair to varying extents, they do not define the primary composition. For example, while hair does contain some moisture and may have trace amounts of lipids that help in maintaining its health and shine, these elements do not constitute its core structural makeup. Understanding this composition is essential for various practices in hairstyling and hair care, as it influences the methods and products used for maintaining hair health and aesthetics.